[-Prodigy-]

This is just a horrible way of doing it, and not to mention that you still gotta add dozens of lines to add more colors.

Here's a quick and simple way of doing it(and can change 127 random colors):

pawn Код:

new
    bool: gRainbow[MAX_PLAYERS] = {false, ...};

CMD:rainbow(playerid, params[])
{
    if(gRainbow[playerid])
    {
        SendClientMessage(playerid, -1, "You've disabled rainbow colors for your vehicle!");

        gRainbow[playerid] = false;
    }
    else
    {
        SendClientMessage(playerid, -1, "You've enabled rainbow colors for your vehicle!");

        gRainbow[playerid] = true;
    }
    return 1;
}

// Mode init
SetTimer("UpdateRainbow", 1000, true);

forward UpdateRainbow();
public UpdateRainbow()
{
    for(new i = 0; i < MAX_PLAYERS; i++)
    {
        if(!IsPlayerConnected(i) || !IsPlayerInAnyVehicle(i) || gRainbow[i] == false)
            continue;

        ChangeVehicleColor(GetPlayerVehicleID(i), random(127), random(127));
    }
    return 1;
}